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Solids Movement in Rotary Kilns in the Slumping Regime: Model Using a Control Plane Parallel to the Steepest Descent
Author(s) -
Gonzalez Luis M.,
Romero Joaquim J. B.
Publication year - 2005
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.200400964
Subject(s) - slumping , plane (geometry) , flow (mathematics) , gradient descent , rotation (mathematics) , mechanics , control theory (sociology) , kiln , constant (computer programming) , descent (aeronautics) , method of steepest descent , mathematics , geometry , materials science , geology , physics , mathematical analysis , computer science , control (management) , meteorology , artificial intelligence , geomorphology , artificial neural network , metallurgy , programming language
A new approach is proposed to model the bulk movement of solids in rotary drums operating at low rotation speeds, in slumping and rolling regimes. The model yields an equation similar to Saeman's equation, but which is valid also for the slumping regime and active area in the rolling regime. The model was developed for constant depth using a control surface containing the steepest descent direction, so that any contribution from sliding particles to flow rate can be neglected. By considering an appropriate virtual kiln, the model is extended to the more general, variable depth situation.